The stream has started, but notch hasn't begun coding yet at the time of this writing (so don't be scared by the still screen).
Those of you who don't know what Ludum Dare is, can check their website at http://ludumdare.com/ - but TL;DR: rapid game dev competition, in 48 hours - Notch (maker of Minecraft) is streaming his participation this year.
Those of you who don't know what Ludum Dare is, can check their website at http://ludumdare.com/ - but TL;DR: rapid game dev competition, in 48 hours - Notch (maker of Minecraft) is streaming his participation this year.